Range-boiler.



UNITED STATES Patented May 23, 1905.

PATENT OFFICE.

RANGE-BOILER.

SPECIFICATION forming partof Letters Patent No. 790,667, dated May 23, 1905.

Application filed April 6, 1904. Serial No. 201,891.

T0 all whom/it may concern:

Be it known that I, VALENTIN WILHELMI, a citizen of the United States, residing in Paterson. in the county of Passaic and State lof New Jersey. have invented certain new and useful Improvements in Range-Boilers, of which the following is a specification.

The object of this invention is to provide an improved range-boiler of copper or other flexible sheet metal. A serious objection to such boilers as heretofore constructed has been weakness at the joints between the heads and the shell.

This invention relates to the joint between the closing head and the shell, the special object of the invention being to provide an anvil-free boiler having a strong and reliable joint at this point.

In Letters Patent N o. 495,236, granted to me April l1, 1893, is shown and described a ,range-boiler provided with an interior reinforcing-ring. This ring was heretofore necessary for providing an anvil against which to drive when hammering down the fold at the joint from the outside of the boiler.

invention, partly in Vertical section through.

the lower part of the same. Fig. 2 is a horizontal section through the joint at the closing end of the boiler on line 2 2, Fig. 6. Fig. 3 is a similar horizontal section on line33, Fig. 6, said Figs. 2 and 3 being made on the same scale as that of Fig. 1. Figs. 4, 5, 6, 7, and

8 are vertical sections illustrating successive steps informing the lap-joint between the shell and head, and Fig. 9 is a vertical-sec- It was commonly made of iron and was inflexiblel 'tion through the completed joint and a portion of the shell and closing-head of the boiler. Similar letters of reference indicate corresponding parts.

Referring tothe drawings, A indicates the boiler-shell, which is of copper or any other suitable sheet metal.

B indicates the upper head of vthe boiler,

' and C the bottom or closinghead of the boiler.

The heads may be applied to the shell in any order; but for purposes of description it will be assumed that the. head B is first applied. The head B may be applied by a joint similar to that between the bottomv C and the shell A. When this is the case, such joint may be readily formed, inasmuch as a suitable anvil carried upon an arm, known in the art as a stake, may be introduced vinto the shell by way of the open end and then removed, when the joint is completely hammered down. No such stake can be employed when forming the joint at the closing-head, because the opposite end of the boiler is then closedu For applying the bottom C the shell A is first provided at its open end with a laterallyprojecting' flange a. Into this open end of the shell is now fitted an interior reinforcingring a', having an offset a adjacent the end of the shell A. The ring projects at its outer 1portion a3 beyond the end `of the shell A.

The head C is now fitted on. Said head is provided with a laterally-projecting flange a4 and a'vertically-projecting lip a5, extending therefrom over-c'. e., beyond-the flange a. By means of a hammer or other suitable tool the lip a5 is now bent down upon the fiange aux. e., into the position indicated by dotted lines in Fig. 4. An inclosing ring D, of iron or other suitable material, having a face d adapted to receive and closely fit the flange 04, affords an anvil for this operation. A tool E is next placed in the position indicated in Fig. 5 and serves in the nature of an'anvil against f the blows of a hammer directedasindicated by the arrow e in Fig. 5, whereby the lapjoint formed in the manner described, and indicated in Fig. 4, is bent or folded partially over toward the shell. The tool E is then replaced by a thinner tool F, Fig. 6, and the lap further bent by hammer-blows in the direction of the arrow f against said tool as an anvil.

By the foregoing operations the lap is partially bent or folded over. It is not possible with the use of a tool inserted between the lap and the shell to turn over the lap as closely thereto as is desirable. On the other hand, should the lap now be hammered from the position shown in Fig. 6 toward the shell without the intervention of any tool between the lap and the shell, there being no interior anvil-ring, (the ring a being merely a thin ring of exible metah) the shell of the boiler would be forced inwardly by the blows of the hammer. It would partially collapse under the blows of the hammer and would be entirely unfit for service. The required final bending of the lap may be accomplished without the employment of an interior anvil-ring by surrounding the head C with an anvil-ring G, Fig. 7, which is provided with a face g, adapted to support a portion g of the flange not previously turned over. The blows of the hammer are not directed exactly against this anvil, and the same does not act directly in the nature of an anvil. It acts rather in the nature of a clamping-ring, which by its tight fit with the head C clamps the iiexible metal and holds it in its true circular position, so that it is enabled to withstand the blows of the hammer. The arrow g2 indicates approximately the direction of the hammer-blows. It is essential that this ring fit tightly the head C; otherwise the clamping effect and the resulting sustaining effect on the metal would be lacking and the blows of the hammer, directed as shown in Fig. '7, (toward the .ring g, nevertheless inwardly therefrom,) would have the effect of beating the entire lap, shell, and inner ring a bodily in inward direction toward the interior of the boiler. The downwardlyexpended force of the blows of the hammer is Yalso resisted to a considerable extent by the offset portion a2 of the inner ring a. This, however, is not due to the strength of that ring in a lateral direction, but is due toits resistance to longitudinal movement, owing to the fact that by a previous operation the ring has been soldered to the shell A and to the head C. This ring is not necessary for the purpose of affording resistance against the blows of the hammer when folding over the lap. It is employed mainly as a strengthening means to prevent tearing apart of the head and shell under pressure exerted within the boiler when the latter is used. It is primarily a bonding-ring.

The joint having been formed in the manner described, an exterior ring H, Fig. 8, is spun over the entire joint.

At various stages in the operation the parts are tinned and soldered. Immediately after the insertion of the ring a the shell and ring are tinned by plunging the same in a bath of molten solder. The solder enters between the ring a and the shell A and effectually tins the whole. The head C is tinned at its edge portion at both sides before being applied to the shell. When the joint is applied, as in Fig. 7, the boiler is again immersed, so as to coat the parts at the outside at the joint and for some distance at either side thereof, and by the same operation the tin at the faces of the portions (t3 of the ring and the adjacent portion of the head C is caused to unite. The ring H is not spun down to the boiler-shell so closely as to be in closing contact therewith. 1t is spun down approximately to the position shown in Fig. 9. Then this is completed, molten solder is run in between the shell and the exterior ring, the parts being heated by means of a blowpipe or other convenient fiame. This solder liows into the lap of the joint and fills the same, as indicated in Fig. 9, and it Hows at the outside of the lap and fills the space between the shell, head, and ring, thereby sealing the joint. The surplus solder is then removed from the exterior of the boiler and the same polished or otherwise prepared for sale in the usual manner.

Having thus described my invention, I claim as new and desire to secure by Letters Patent-- A range-boiler comprising a cylindrical shell having one of the heads thereof secured to the same by means of a folded lap-joint, an interior reinforcing-ring adjacent said lapjoint and provided with an offset supporting the same, and an exterior ring extending over the lap-joint and the adjacent ends of the shell and head.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

VALENTIN VVILHELMI.

Titnessesz HENRY J. SUHRBIER, JACOB H. GLAnssnR.

IOO 

